Drill steel retainer



Jan. 1, 1935.

w. A. SMITH, YJR.. ET AL DRILL STEEL RETAINER Filed March 16, 1934 w M mm mwm A TTORNE Y 5 a drill steel retainer ofthe 'swi-nging'yoketype Patented Jan. 1, 1935 V ILL's'rE pREtrn NEa i William A Smithf Jig; N'Bith' Arlington/N. J.,

. and-{Herman}. Schorle, Astoria, ,Long Island,

This invention relatesfto r'ek 'drills oranalogous percussive tools and moreparticularlyio drill steel retainers therefor;

An object of. the present invention is tot-provide which will prevent ejection of the drill steel from the front end "of the drill during'operation and also'to provide a practical si p1e "mechanism for locking or-"holding' the s'winging retaining; yoke in or out 'of- 'dril1 steelretaining position.

With these and other objects in view" as may appear from the accompanying specification, the invention consists of 7 various features" of 'c'on-- struction and combination of parts, whibl ;will be first described in connection with the scam:

panying drawing, showing drill steei reta ners of the preferred form, and the 'features 'foririing the invention willbe specifically pointed out in the claims I i In thedrawing: I

Fig. 1 is a view partly in side elevation and partly in section of the improved drill steel retainer.

Fig. 2 is an elevation of the retainer.

Fig. 3 is a cross section through the retainer taken on the line 3-3 of Fig. 2.

Referring more particularly to the drawing, the front head 1 of any approved type of rock drill or percussive tool which receives the collared shank 2 of the drill steel has a pair of laterally extending arms 3 and 4 formed thereon,

which project in opposite directions from the axis of the front head 1 as clearly shown in Fig. 2 of the drawing. The arms 3and 4 are each provided with bores 5 in which removable bushings 6 are mounted. The bushings 6 receive therethrough the retainer bolts 7 andv 8 each of which has a head 9 formed on its outer or lower end. The heads 9 abut the flanges 10 formed on the bushings 6 and are held in yieldable engagement thereagainst by the springs 11. The springs 11 are coiled about the retainer bolts 7 and are tensioned by the nuts 12.

Each of the heads 9 has a pair of outwardly extending or depending ears 13 and 14 formed thereon between which thepivot heads 15 of the swinging yoke 16 engage. The swinging yoke 16 has a retaining head 17 formed thereon which engages the shank 2 of thedrill steel. and is adapted to be engaged by the collar 18 on the shank 2' to prevent ejection of the drill steel from the front end 1. The heads 15 of the swinging yoke retainer 16 have flat locking surfaces 19 and 20 formed thereon which are engaged by the head 21 of the locking plunger 22.

" Y.', j'ass'ignqrs to Worthington,,l?umpj and I achinery Corporation, New[York", N;;1Y., a. 1

1 1 @Ann ji t n arhlw 4.3 Serial orim o1.*12

The locking plunger-22 extends slid ably into the bore 23 -torme'd in the'retainer bolts '7." Springs 24 aremountedfinthe bores 23 and engage the locking nte ers- 22 for urging 'the heads 21 thereof into engagement withthe flat surfaces rs- 5512 f'or'holding the swinging yoke 16 in or ears 14.

" ill itis so'jde red, projections as: indicated at 39 may be-formedon tlie'fronthead lfto iorm stops for lirniting the inward movement of thepins 2v. l The bushings 6' are .provided'so that incase of wear occasioned-by: thefrearward movement o'f' 'the-retainerboltsthbushihgs may be renewed without requiring renewal of the bolts or the entire retainer.v

It is to be understood that the invention is not to be limited to the specific construction or arrangement of parts shown but that they may be widely modified within the invention defined by the claims.

What is claimedis:

1. In a percussive tool, a drill steel retainer comprising a front head adapted to receive the shank of a drill steel, a collar on said drill steel, a pair of laterally extending arms on said front head, said arms provided with bores therethrough, bushings in said bores, retainer bolts extending through said bushings, yieldable means normally urging the heads of said bolts against said bushings, ears formed on said heads and a drill steel retaining yoke swingably connected to said ears and engaging said collar when said drill steel is in the forward position.

2. In a drill steel retainer for a percussive tool, the combinationwith a front head adapted to receive the shank of a drill steel, a collar on "said drill steel and having a pair of laterally extending arms thereon, said arms provided with bores therethrough, bushings in said. bores,

flats thereon, resilient means independent of said yieldable means urging said plungers against said flats to hold the yoke in or outof steel retaining position.

3. In a drill steel retainer for percussive tools, the combination of a front head, mounting lugs on said front head, retainer bolts, yieldable means for normally holding the heads of said bolts against the forward edge of said lugs, a yoke swingably carried by the heads of said bolts, said bolts being provided with a bore, a

looking plunger slidably mounted in said bore, and resilient means operable independent of said yieldable means and urging said plunger against said yoke.

4. In a drill steel retainer for percussive tools,

the combination of a front head, a drill'steel received by said front head, a collar on said drill steel, arms on said front head,'retainer bolts extending through said arms, heads onsaid bolts, resilient means adjacentto said .boltsnormally holding said bolt heads securely against said arms, an-adjustment mechanism for adjustably regulating the tension of said resilient means, a yoke swingably mounted on said heads, flattened portions on said yoke, said .bolts being provided with a bore, a plunger in said bore, compressible means in said bore, said compressible means urging said plunger against said flatfor adju'stably. regulating the tension of said yieldable means, a yoke swingably secured to said bifurcated heads, flattened portions on said yoke, said bolts :being provided with a .bore

compressible means. l

communicating with the bifurcated portion of the head, a plunger in said bore, resilient means in said bore urging said plunger against said flattened portions, said plunger extending outwardly into the bifurcated portion of said bolts.

6. In a drill steel retainer for percussive tools, the combination of a front head, a drill steel received by said front head, a collar on said drill steel, arms on said front head, retainer bolts extending through said arms, heads on said bolts, relatively strong resilient means adjacent tosaid bolts normally holding said bolt heads against'said arms, an adjustment mechanism for adjustably. regulating the tension of said relatively strong resilient means, a yoke swingably mounted on said heads, flattened portions on said yoke, said bolts being provided with a bore, a plunger in said bore, compressible .meansin said bore mounted independent of said relatively strong resilient means, said compressible means being relatively weak and urging said plunger against said flattened portions.

7. In a drill steel retainer for percussive tools, the combination of a front head, a drill steel received by ,said front; head,a collar on said drill steel, arms on ,;said front head, retainer bolts extending through said arms, heads on said bolts, relatively strong resilient ;means adjacent to said bolts normally holding said bolt heads securely against :said arms, a yoke swingably mounted on said heads,-flattene d portions on said yoke, relatively weak compressible means engaging :said 1 flattened portions, an I adjustment mechanism :for I adjustably regulating,

the tension of .said relatively strong resilient means, without affecting the WILLIAM A. SMITH, JR. HERMAN; J. 1SCHORLE.

resiliency of said 

